Coaxial cable



Nov. 2, 1948. M R 2,452,@4$

COAXIAL CABLE Filed May 13, 1944 Jfi'gf. 5:

INVENTOR Lou/.3 H MoAw/v ATTORNEY Patented Nov. 2, 1948 COAXIAL CABLE Louis H. Morin, Bronx, N. Y., assignor of one-half to Davis Marinsky, Bronx, N. Y.

Application May 13, 1944, Serial No. 535,405 4 Claims. (Cl. 174-27) This invention relates to what is commonly referred to as coaxial cable. More particularly, the invention deals with conductors of this type and k'nd employing disc-type insulators spaced longitudinally of the conductor strand and arranged at an angle of inclination or skew on the conductors in order to distribute the outer peripheral surfaces of the discs throughout a greater length of the area of the outer conductor, as well as upon the inner conductor of the cable. The novel features of the invention will be best understood from the following description when taken together with the accompanying drawings, in which certain embodiments of the invention are disclosed and in which the separate parts are designated by suitable reference characters in each of the views, and in which:

Fig. 1 is a diagrammatic side and sectional view showing one arrangement of insulators which I employ.

Fig. 2 is a section on the line 22 of Fig. 1.

Figs. 3 and 4 are views similar to Fig. 1 showing other adaptations of my invention; and

Fig. 5 is a section on the line 5-5 of Fig. 4.

In the diagrammatic illustrations shown in the accompanying drawing, I have not illustrated a completely formed cable, but have simplified the showing to such parts of the resulting cable with which my invention is specifically concerned, namely the inner conductor, upon which the insulators are arranged and part of the outer conductor or enveloping jacket is also shown.

My invention deals primarily with the formation of the die cast insulators upon the inner conductor, for example, plastic die castings, such as of polyethylene, which may be cast two or more at a time directly upon the conductor and thereafter the outer conductor or jacket is mounted upon the insulators.

In Fig. 1 of the drawing, l0 represents the inner conductor, upon which are arranged at spaced intervals insulators II in the form of discs cast on the conductor ID at an inclination to a perpendicular to the axis of the conductor or in what might be called a skewed position or an oblique position. It will thus be seen that the part i2 of the discs arranged directly upon the conductor ill have, with a given thickness of disc, a greater surface contact with the conductor than would be the case if the discs were arranged perpendicularly to the axis of the conductor and, further, the discs spread over a longitudinal area of the conductor a distance greater than twice the thickness of the discs. It will also appear that the outer surfaces I3 of the discs are parallel to the axis of the conductor I 0 to fit in the bore of the outer tubular conductor or jacket I. The surfaces l3 spread over a longitudinal area of the bore of the conductor H a distance many times reater than the thickness of the insulators. Also, the widthwise distance of contact of the discs at the surfaces I 3 with the conductor i4 is greater than the thickness of the discs.

This construction permits a greater spacing of the discs, one from the other, than would be possible with discs arranged perpendicularly to the conductor axis and, at the same time, provides, between the spaced discs, the desired air space. Still further, it will be apparent that the extremity of a disc, at one side of theconductor, overlaps the other extremity of an adjacent disc at the other side of the conductor, thus establishing a greater longitudinal distribution of the insulator bodies throughout the conductor.

The structure of Fig. 3 of the drawing differs from that shown in Fig. l in arranging converging insulators l5 and H5 at spaced intervals along an inner conductor I! in such a manner that each pair of insulators I5 and I Ii is arranged in the same manner upon the conductor and the insulator l5 of one pair converges with the insulator l6 of an ajacent pair, as at l8, so that a resulting zig-zag arrangement of the insulators is provided throughout the full length of the conductor. The insulators i5 and I6 have outer surfaces 19 parallel to the axis of the conductor l1 and which fit in the bore of an outer conductor or jacket 20. With the construction shown in Fig. 3, a wide spacing is provided between the ends 2| and 22 of the insulators i5 and I6 and a corresponding spacing is provided between the ends 23 and 24 oi the insulators l5 and iii of adjacent pairs. This construction does not provide the overlapping of the insulators, as seen in Fig, l of the drawing. However, the insulators do spread themselves throughout the major portion of the length of the outer conductor 20 and would provide a more firm and rigid cable than would be the case with the structure shown in Fig. 1, which cable would be flexible in use.

In Figs. 4 and 5 of the drawing is shown another modification of the structure shown in Fig. 1; wherein insulators 25 are arranged at a greater angle of inclination and, further, are cast directly upon a pair of parallel conductors 26 and 21 to be mounted in an outer conductor or jacket 28, otherwise the structure of Figs. 4 and 5 is the same as that shown in Figs. 1 and 2.

Having fully described my invention, what I 3 claim as new and desire to secure by Letters Pctcut is:

1. In flexible coaxial cebie comprising an inner conductor and a tubular conductor enveloping the inner conductor in spaced relation thereto, the combination therewith of die cast insulators on the inner conductor spaced longitudinally thereof and adopted to position said inner conductor within said tu oulolconductor, said insulators comprising discs arranged at an inclination to sold inner conductor, each disc being parallel to discs, the extremity oieach disc at once inner side of the tubules conductor being in over- 3 relation to the-extremity oi an adjacent e opposite inner side off said tubules" con- 1 fieizi'oie coaxial. cable comprising an lone:-

uctea" tubular eonductoz paced i'e'letioii thereto, toe 1 insulators on the Linnea" uditeeliy thereof ad h coneuctor Witio Juicy conductc uletors comp is 5 arranged at s to said iimer opposed sutfieces of adjacent discs be- 1, the extremity of each disc at one intlie tubular conductor being in oves lappin relation to the extremity of an disc the opposite inner side of said tubular con ductor.

3. In flexible coaxial cable comprisingva pair of inner conductors and c tubular jacket in spaced relation thereto, the combination therewith of die cast insulators on the inner conductors spaced longitudinally thereof cod adapted to position said inner conductors within said tubular jacket, said insulators comprising discs arranged at an inclination to said inner conductor, each disc ioe= mvelcpizcg the 5} mg parallel to adjacent discs, the extremity of each disc at one inner side of the tubuloi" ccn= ductor being in overlapping relation to the oti'iei extremity of on adjacent disc at the opposite inme side of said tubular conductor.

4. In flexible coaxial cable comprising a, pair oi inner conductors and a tubular jacket in spaced relation thereto, the combination therewith insulators on the inner conductors spaced, longitudinolly thereof and adapted to position said iiiner conductors Within said tubular jacket, 5 d insulators comprising discs arranged at clination to said inner conductor, each disc 1 parallel to adjacent discs, the extrei disc at one inner side of the illiblh being in overlapping relation ity of an adjacent disc at the opposite in c. of said tubular conductor.

following references are of secord 1 this potent:

U Numb-e1" 3., iifiti'o Wilson 2, 04,737 swallow no 22%,990 Gits 7,. 2,351,529 Ketzin June i3, 1 2,351,927 Loiitini June FUREEGN PAcLfiNLS Number Country Date 48,593 France Jan. 5, 1938 (5th addition to No. 810,031) 4%,885 Great Britain July 15, 1938 

